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I am getting city water (have a well now). The pipe from the main to the meter box is 3/4 inch. The distance from the meterbox to the house is 650 to 700 feet. Does it make any sense to run a 1 inch line from the meterbox to the house to combat friction loss? The house has mostly 1/2 inch lines of various material-copper plastic- it's a 160 year old farm house.

  • Hello, and welcome to Home Improvement. Some more details (e.g. what's your max expected water flow) might help. And, you should probably take our tour so you'll know how best to participate here. – Daniel Griscom Oct 2 '19 at 1:51
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    How far VERTICALLY is it? What is the elevation difference? – Harper - Reinstate Monica Oct 2 '19 at 2:47
  • the meter is about 6 to 8 feet higher than the entry into the house. the second floor of the house would be 6 to 8 feet higher than the meter and there is a 2nd story bathroom – shannah Oct 2 '19 at 3:20
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    If cost was not a huge difference you could even consider running 1.25 inch size for that long distance. – Michael Karas Oct 2 '19 at 6:19
  • For the cost differential, I would put in 1" or even 1.25"--even if it doesn't improve the situation because one day the water co. may replace the mains in your area and you could upgrade to a larger meter. You'd hate to dig that line twice, wouldn't you? @Michael Karas is right. – peinal Oct 2 '19 at 15:46
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The intuition of the commenters is good. There are online tables if you want to to calculate it. The vertical distances that you mentioned are not significant. 8 feet of elevation is about 3.5 psi.

enter image description here https://www.engineeringtoolbox.com/pressure-loss-copper-pipes-d_930.html

Let's assume that you want a flow rate of 10 gallons per minute, and the pipe length is 700 feet. The pipe losses are as follows:

3/4"    91 psi loss    (700 * 0.13)  - Clearly unacceptable
1"      21 psi loss    (700 * 0.03)  - Might be OK depending on your street pressure
1 1/4"  8 psi loss     (700 * 0.011) - Good, this is where I would want to be

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